The high commissioner of the United Kingdom to Canada is the United Kingdom's foremost diplomatic representative in Canada and is in charge of the British diplomatic mission to Canada. As fellow members of the Commonwealth of Nations, diplomatic relations between the United Kingdom and Canada are at governmental level, rather than between heads of state. Thus, the countries exchange High Commissioners, rather than ambassadors. The offices of the British High Commission are at 80 Elgin Street in Ottawa, which was built in 1964 on the site of the old .